package com.lin.springcloud.service;

import cn.hutool.core.util.IdUtil;
import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;
import com.netflix.hystrix.contrib.javanica.annotation.HystrixProperty;
import org.springframework.stereotype.Service;
import org.springframework.web.bind.annotation.PathVariable;

import java.util.concurrent.TimeUnit;

/**
 * @author Created by Lin Weihong
 * @date on 2022/4/2 23:00
 */
@Service
public class PaymentService {
    public String paymentInfo_OK(Integer id) {
        return "线程池： " + Thread.currentThread().getName()
                + "paymentInfo_OK,id:   " + id + "\t" + "哈哈哈哈哈哈哈";
    }

    @HystrixCommand(fallbackMethod = "paymentInfo_TimeOutHandler", commandProperties = { //系统服务不可用，就去执行备选响应
            @HystrixProperty(name = "execution.isolation.thread.timeoutInMilliseconds", value = "3000")  //3秒钟以内就是正常的业务逻辑,
            //超过3秒，就认为系统异常
    })
    public String paymentInfo_TimeOut(Integer id) {
        int timeOut = 1; //超时导致系统服务不可用
//        int a = 10 / 0;//异常导致服务不可用
        try {
            TimeUnit.SECONDS.sleep(timeOut);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        return "线程池： " + Thread.currentThread().getName()
                + "paymentInfo_OK,id:   " + id + "\t" + "哈哈哈哈哈哈哈"
                + "耗时(s):  " + timeOut;

    }

    public String paymentInfo_TimeOutHandler(Integer id) {
        return "线程池:  " + Thread.currentThread().getName() + "系统繁忙或报错，请稍后再试" + "/(ㄒoㄒ)/~~";
    }

    //==============服务熔断===============
    //@HystrixProperty配置都在HystrixCommandProperties类当中
    @HystrixCommand(fallbackMethod = "paymentCircuitBreaker_fallback", commandProperties = {
            @HystrixProperty(name = "circuitBreaker.enabled", value = "true"),  //是否开启断路器
            @HystrixProperty(name = "circuitBreaker.requestVolumeThreshold", value = "10"),   //请求次数
            @HystrixProperty(name = "circuitBreaker.sleepWindowInMilliseconds", value = "10000"),  //时间范围
            @HystrixProperty(name = "circuitBreaker.errorThresholdPercentage", value = "60"), //失败率达到百分之多少后跳闸
//            10s钟发送的10次请求，如果有60%的请求失效，直接熔断
    })
    public String paymentCircuitBreaker(@PathVariable("id") Integer id) {
        if (id < 0) {
            throw new RuntimeException("id不能是负数");
        }
        String serialNumber = IdUtil.simpleUUID();
        return Thread.currentThread().getName() + "\t" + "调用成功，流水号为" + serialNumber;
    }

    public String paymentCircuitBreaker_fallback(@PathVariable("id") Integer id) {
        return "id 不能负数，请稍后再试/(ㄒoㄒ)/~~ id: " + id;
    }

}
